Brake.



.97 og'73s.

' 1 E. A. mmson.

BRAKE.

APPLIOATIOK FILED JULY 16,1909.

- Patented se 20, 1910;

: UNITED STATES PATENT OFFICE. v

nMIL A, nntson, or nnrnoir, MICHIGAN, AYSSIGNOB. To err MOTOR can:COMPA'NT, F DETROIT, MICHIGAN A QOItPORhTION 0F, MZtCHIGAN. I

To all whom itmay concern:

Be it known that I, Earn, A. Nnlison, a. citizen of the United Statesof-America, residim at Detroit, in the county of \Vayne and tate ofMichigan, have invented certain new and useful" Improvements in Brakes,'of which the following is a speci-- fication, reference being hadtherein to the accompanying drawings.

The Invention relates to brake mechanisms more particularly designed forapplicationto motor vehicles, and the invention consists if; certainfeatures of -constructlon as hereina'fter set forth. i

In the drawingsr- Figure l is. ahorizontal section through the bralre'in the plane of the axle; and Fig. 2 is a vertical section on l"nismsone for normal 'use and the other forline, Fig. 1.

A is t'he'axle of a -1notor .vel1icle, B the wheel huh, C the axlehousing and D the brake drumlpreferably secured to the wheel.

It is usual with motor vehicles to provide two independently operablebrake mechause in a case of emergency. With tlie presetit construction,these 'two independent brakes are both arranged withi'n'the drum D, andare constructed for mutual coo eration as follows: E and F are'two rpcksrafts for operating the respective brakes, arranged upon diametricallyopposite sides of the drum and. parallel to the axle. These shafts arereferably journaled in bearings H, whic are integral with a circularenlargement I of the axle housing C, which, to-' .the opposite ends ofsaid shoes, the arrangement being such that a rocking of the cam willcause a separation of said bearings and expansion of the shoes.

With the construction as described, in

I operation the rocking of'either of the shafts E or F will cause theexpansion of its corresponding shoe and the application of the brake,the other shaft serving as a pivot BRAKE.

' Specification of Letters ratent. Patented Sept, 20, 1910, Applicationfiled 'Jui c, 1909. Serial No. 508,030. a

bearing and anchor for the shoe. Uponthe reverse rotation of the cam,the shoes are released and springs N, which connect their. oppositeends, will draw them from frictional contact withthe brake ,drum.Furthermore, the engagement of said shoes with the two diametricallyopposite points of support formed by the two shafts willhold them fromaccidental contact witlr the surface of the drum.

Another advantage of the constructhm is that the brake shoes J and K arethe same in construction and are interchangeable.

Thus if in the operation of the machine the,

shoe for the main brake should be broken or in anyway inoperative itcould be removedand replaced by the shoe for the anothershoe isobtained.

hat I claim as my invention is: l ,1. A brake mechanismacomprisingabrake- 4 drum, a pair of adjacent expansible brake emer ,,rency brake,which-can housed until shoes arranged within said drum, and rock shaftsfor respectively expanding s'aid' shoes arranged on diametricallyopposite si esof the drum, each shaft constituting an anchor -for..theopposite shoe.

2. A brake mechanism comprisinga brake drum, :1. pair of adjacent splitannu r brake shoes arranged within saiddrum, with their points ofseverance upon opposite sides thereof, cams for expanding said shoesarranged in the splits thereof, and cam shafts for said cams, eachconstituting a pivot anchor for the op )osite shoe.

3. A brake mec anism comprising a brake drum, a stationary head forminga closure for said drum, a pair of adjacent split an-' 'nular bralteshoes arranged W1 thin said drum,

shafts journ'aledin saidstationary head upon diametrically oppositesides thereof, each forming a central pivotal anchor for one of theshoes, and cams on saidv shafts for expanding the opposite shoe.

4. A brake mechanism comprising a brake drum, a pair of brake shoestherein,-and means for independently operating said shoes, the operatingmeans of each shoe constituting an anch'or for the othershoe.

In testimony whereof I allix my signature in presence of two witnesses.

I EMIL A. NELSON. Witnesses:

CHAS. D. HAs'rINos, JOHN E. BAKER.

